The Rayovac Extra Advance Hearing Aid Batteries in Size 10 are high-quality batteries designed specifically for hearing aids. With a voltage of 1.45, these batteries provide reliable power for extended periods, ensuring that users can rely on their hearing aids throughout the day. The 4 packs of 6 batteries included in this product offer convenience and peace of mind, knowing that users have a supply of batteries on hand to last them for an extended period of time.